Rod-guide for dowel-machines



No. 607,037. Patented luly l2, I898.

R. HARRIS.

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R. HARRIS.

ROD GUIDE FOR DOWEL MACHINES.

(Application filed Mar. 15, 1897.) (No Model.) 2 Sheets$heet 2.

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RUTLEDGE HARRIS, OF CEDAR FALLS, IOVA.

ROD-GUIDE FOR DOWEL-MACHINES.

SPECIFICATION forming part of Letters Patent No. 607,037, dated July 12,1898.

Application filed March 15, 1897.

To all whom, it may concern:

Be it known that I, RUTLEDGE HARRIS, a citizen of the United States,residing at Cedar Falls, in the county of Black Hawk and State of Iowa,have invented certain new and useful Improvements in Rod-Guides forDowel- Machines; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to machines for turning rods or dowel-stock andthe object of the invention is to so construct the guide through whichthe turned rod passes as to impart to the rod a smooth and uniformsurface.

The particular device which forms the subject-matter of this inventionwill be fully hereinafter described and claimed, reference being had tothe accompanying drawings, in which- Figure 1 is a front view of amachine embodying my invention, but without the front guide, whichprevents the stick from turning as it passes through the cutter-head.Fig. 2, Sheet 2, is a sectional view of the same as seen from the rightof line 00 a: of Fig. 1.

Similar letters of reference indicate corresponding parts.

The machine to which my invention is applied is in common use, and itsconstruction is simple and well known. On a suitable support, suchas apost A, is mounted a head block B, in whichis journaled ahollow mandrel0, provided with a pulley D. In one end of the mandrel is screwed acutter-head E, to which are attached one or more knives, preferably apair, as F F. Through a central hole in the cutter-head extends a guideGfor the turned rod, and this is secured in place by a set-screw E. Thehead G of this guide has a flaring mouth, with openings G G in the sidesthereof to admit the cutting portions of the knives and allow for theescape of chips. The tail portion, extending inside the mandrel, is ofconsiderable length, so as to make a good bearing for the turned part ofthe rod and insure straightness therein. .It will also be understoodthat the stick, which is sawed square in cross section, passes through asquare hole in a guide-block in front of the it off.

Serial No. 627,724. (No model.)

stricted portion of the guidethat is to say,

apart of the guide somewhat smaller than the rod as the knives leave it.Accordingly I make the guide,with a constricted portion Gr just at thebottom of the throat, enough smaller than the rest of the hole in theguide to burnish the rod as it passes through, but leaving the extendedtail of the guide to perform its proper function and hold the rodstraight as it is fed through. The length of this constricted portion,as well as its differ- 7o ence in diameter from that of the tailportion, may vary according to the size of the work produced. It shouldnot be so much smaller than the rod as it leaves the knives to burn therod by excessive compression or friction, nor so long as to pinch it andtwist The proportions shown in the drawings are approximately correct.

The cutters are set so as to cut somewhat largerthan the hole Gtheamountofmuchifit difference varying with the size of the work, asabove suggested. The effect of this construction is to greatly improvethe product of the machine. Rods made by it even of comparatively softand spongy wood, such as soft pine or poplar, come from the machine witha surface almost as smooth as though carefully sandpapered and with adistinct polish, as though burnished, and this result is attainedwithoutin the least diminishing the 0 speed or capacity of the machine.

In practice the guides for different sizes of rods are all made the samesize externally, so as to fit the cutter-head, but are bored to the sizeof the rod as desired.

I am aware that the principle of burnishing wood by the pressure of asmooth metallic surface upon it while revolving rapidly is not new; butI am not aware that the principle has been applied hitherto in the formof a :00

solid unyielding die having a smooth short hole slightly smaller thanthe rod as it leaves the cutters. An essential feature of this form ofpolishing 0r burnishing device is that it not only burnishes the rod,but accurately sizes it throughout its whole length and regardless ofinequalities in the quality or character of the Wood.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is

1. A revolving rodguide for dowel-machines, having a main, central holefor the rod, of substantially the same size as the rod as left by thecutters, for nearly its entire length, but with a short non-eXpansibleportion thereof of a reduced dia1neter,and adapted to compress, size,and polish the rod, as set forth, in combination with a cutter adaptedto give cylindrical form to the stick, and a little larger than theconstricted part of the said guide.

2. The herein-described revolving rod-guide for a dowel-machine, havinga flaring mouth and a central hole for the rod to pass through, whichhole is constricted and non-expansible for a short distance back fromthe mouth, so as to compress, size, and polish the rod Without burningor otherwise injuring it, in combination with a cutter adapted to givecylindrical form to the stick, and a little larger than the constrictedpart of the said guide.

In testimony whereof I afiix my signature in presence of two Witnesses.

RUTLEDGE HARRIS.

Vitnesses:

HUGH MOCARTNEY, N. H. HARRIS.

